【摘 要】
：
Poly(vinylidene fluoride) (PVDF) hollow fiber membranes were prepared via a phase inversion/chemical treatment method,using N,N-dimethylacetamide (DMAc) as solvent,Calcium carbonate as inorganic addit
【机 构】
：
School of Environmental and Municipal Engineering,Xi'an University of Architecture and Technology
论文部分内容阅读
Poly(vinylidene fluoride) (PVDF) hollow fiber membranes were prepared via a phase inversion/chemical treatment method,using N,N-dimethylacetamide (DMAc) as solvent,Calcium carbonate as inorganic additive,water and HCI as coagulation media.Effects of external coagulation bath and bore fluid composition on membrane performance were investigated by using scanning electron microscopy (SEM),mechanical properties,porosity,average bubble point pressure,and permeation preformance.The results showed that:(1) The cross-section morphology of membranes have no significant change,exhibiting a two-layer finger-like structure extended to the middle of the cross-section.(2) When we introduced HCI as the 2nd coagulation,the roughness of the exteral surface increased considerably and the number of the surface pores increased as well.The permeation experiments reveal that acid treatment had no impact on fibers which had precipitated completely.(3) The number and pore size underlying the inner skin layer increased when bore fluid changed from DI water to 10% acetic acid,led to the decrease of porosity and tensile strength.Moreover,the pure water flux increased from 360L/(h.m2) to 580 L/(h.m2) without significant change of BSA rejection.The PVDF/CaCO3 membranes prepared from the dope with 10% acetic acid as the bore fluid and 1 mol/L HCI as 2nd coagulation bath had the best UF performance.
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